Method of brazing two metal heads to a metal barrel to produce a bobbin for yarn



June 14, 1960 s, BARNES 2,940,169

METHOD OF BRAZING TWO METAL HEADS TO A METAL BARREL TO PRODUCE A BOBBIN FOR YARN Filed April 5, 1955 2 Sheets-Sheet 1 Hit June 14, 1960 H. s. BARNES 2,940,169

METHOD OF BRAZING TWO METAL HEADS TO A METAL BARREL T0 PRODUCE A BOBBIN FOR YARN Filed April 5, 1955 2 Sheets-Sheet 2 uim\\\\\\\ United States Patent 'METHOD OF BRA'ZING TWO METAL HEADS'TO A ll/IETAL BARREL TO PRODUCE A BOBBINFOR YARN Harold Barnes, Allentown, Pa., assignor to Allentown Bobbin Works, Allentown, Pa., a corporation of Penn= sylvanla Filed Apr.'-5,'1955,1Ser.fNo. 499,267

4 Claims. (cries-airs The present invention relates to a method of making a bobbin.

A purpose of the inventionis to produce a hflbblll or thread to enter the space between the barrel and the head, and become caught or sufier damage thereby.

A further purpose is to produce' a unitary metallic v bobbin comprising a metallic barrel, metalliciheads'on opposite ends of the barrel and a continuous ring of brazing alloy extending around the barrel at" each end and uniting the barrel to the heads, the brazing alloy forming an outward fillet connected to the barrel atone end and-to the head at the other end, and preventing" intrusion of yarn or thread between the-head 'and the barrel.

A further purpose is to hold thebarrel centrally with respect to the head'by projections on the head.

A further purpose is to unite the barrel to the head by deforming the head along the line of the inside diameter of the barrel to produceprojections, placing the barrel in vertical position on one head with theprojections engaging the inside of 'the barrel, 'placing'brazing metal around the inside of the barrel adjacent the engagement between the barrel and the 'head, rotating the combination on a vertical axis while heatingthe'combination adjacent the engagementuntil brazing" metal flows outward to form an outside fillet between the'barrel and the head, and to join together the barrel andthe head, and

allowing the brazing metal to solidify.

tion and clear demonstration of the principles involved.

Figure l is a side elevation of a completed bobbin according to the invention.

Figure 2 is a transverse section "onthe lined-2 of Figure 1. I

Figure 3 is a fragmentary enlarged section'on' the-line 3-3 of Figure 2.

Figure 4 is an exploded perspective showing t-he' components prior to assembly.

Figure '5 is a fragmentary exploded-section on the line 5-5 of Figure 4.

Figure dis a section corresponding to Figure 5, showing the components assembled prior to brazing.

Figure'7 is a section corresponding-to'Figure 5 showing the brazing operation.

Eigure'8 is a plan sectionon-the' line 8'-8 of -Figure 7.

2,940,169 Patented June 14, 1969 Fi'gure 9' is afragmentary enlarged axial section showing the components assembled prior to brazing.

Figure 10 is a view corresponding to Figure-Qshowing the components after brazing.

Describing inillustration but not in limitation and referring to the drawings:

In the prior art bobbins have been extensively .pro

duced using head and barrel portions whicharejoined together by rivets with felt inserts placed betweenithe ends of-the heads and the ends' of'the barrel portion.

Difliculties havebeen encountered with this construction. Nylon and similar synthetic yarns or threads are in'many cases heat treated after winding on the bobbin, usin'g temperatures which may .in indiVidu'al instances betas high as 300 By virtueof the heat treat-ment,zthc yarn-.inmany cases exerts powerful forces on therbobbin whichtin some in tances have been great enoughtmde- 7 form or dish the heads.

A further difiiculty is that under the highforces which develop, the yarn or thread often has'been forced against the felt so as to compress, -mat and deform-the:. felt.

break.

Efforts have also been i made to produce a. bobbinzby cutting holes in the heads, ex-tending the barrel beyond the-heads, and spinning the ends of .the 'barrel over to secure the heads. This construction has notJin many cases been satisfactory'becauseiof its tendency totdeforr n rbyidishing of theheadsunder pressure. i

"There is a serious need fora unitary metallici'bobbin which will be of substantially-increased strength; .thus 'more .eilectively resisting the stresses 'producedi'byi.zthe thread 1:or yarn, and at the same tirneipreventing the tendency which has previously .existed in some cases; for the thread or. yarn to catch between the head andlthe barrel.

1 I have discovered that an improved uuitarymetallic bobbin can be produced by uniting the'barrel to :therheads by 'brazingso as to develop an external fillet which will prevent, the thread or yarn. from enteringthespacesbetweenthe head and the barreLaa'nd retaining thezhead-tin proper position with respect to the barrel by projections .on the head.

I have further discovered that this construction can be efiectively brazed, while :holding the barrel centered by meansof the projections, by applying .theheatzatthe outside adjacent the joint, rotating the combination-and supplying the brazing metal from the inside, continuing the rotation until thexfilletris-formedion the outsideand .then immediately cooling the combination.

.This assures ,a construction that .is 'quite strong and resistant against loads encountered in service.

In the drawings I illustrate a bobbin 20, having abarrel 2 1 and heads 22. -While other metals such as stainless .steel may be used for ,the barrel and the heads, ittisrdecidedly preferable to manufacture the-same'of aluminum base alloy which may be united by brazing. -While alurninunrbase. alloys such as, 25 and-3S maybe ,used; 'because of the requirernent ofhigh strengthit is preferable to use 618 andlto heat treat the-same, desirably to 61ST.

' The hsad p e nro ed t s i i a dgeonslfi h 'ma h ofisiain' ste La wh c su m ke forced fits in axial openingsjn theheads. ,Thej'gudgeons have openings axially in linewhich'pr'ovide the p ml mounting for-the bobbin aswell known.

The heads and the barrel are unitedby brazingmetal at24 which in the case of aluminum base alloy heads and barrel will be aluminum brazing alloy of the character produced-torexample'by'AluminumCompanyof'America external circle diameter to the interior diameter of. the

ftubular barrel thus locating the barrel centrally of the 7 head.

, In manufacturing thebobbin of the invention, the barrel is first produced suitably of tubing, and the ends are cut off desirably on an outward taper at an angle 28 shown'in -,Figure 9 which is less than the 6", more than 1 and pref:

erably about 3 This angle permits flow of brazing metal more readilytoward the outside." In forming the bobbin,

one of the heads 22 is placed in horizontal position with the projections 27 upwardly directed and aring of brazing metal 30 is centrally located aroundthe axis onthe head. The barrel 21 is then placed symmetrically in post tion around the outside of the projections as shown in Figure 6, the axis of the body being vertical. The structure is desirably mounted on a'rotating turntable 31. as shown in Figures 7 and'8, for example using the gudgeon hole 29 to centeron a pin, and heat from a suitable flame 32 is directed inwardly against the'outside of the joint will doubtless become evident to others skilled in the art to obtain all or part of the benefits of my invention with out copying the structure and method shown, and I, therejfore,claim all suchinsofar as they fall within the reasonable spirit and scope of my claims. 7

Having thus disclosed my invention what I claim as new and desire to secureby Letters Patentist; v v

1. "In a method for produ ing a unitary metallic bobbin for yarncomprising a metallic barrel, metallic heads on opposite ends of the -barrel each secured in place a brazing alloy forming arr-outward continuoiis symmetrical fillet connecting to the barrel at one end of the fillet and to the head at the other end of the fillet so as to prevent the intrusion of yarn or thread between the head and the barrel, the steps comprising providing a. tubular metallic barrel and a pair of metallic heads, and each of the heads havinga plurality of projections for engaging the inside surface of the barrel at spaced locations and for aligning the head with respectto the barrel, placing ,thebarr el end wise in vertical position on a face of one of said heads with. the projections on the one head engaging the inside ofthe barrel and disposing a supply of brazing metal in side the barrel adjacent to where said barrel is'engaged between the head and the barrel. Due to the surface ten-.

sion characteristics of the structure, the brazing alloy meltsand notwithstanding that the rotation may be, rather slow (suitably of the order of 20 r.p.m.) the brazing alloy I v flows outward in the spacing between the barrel and the head to form the fillet 25. The rotation makes the fillet symmetrical and assures uniform heating. 'TheL efiFect therefore is to form a unitary structure with the brazing metal uniting the barrel to the head and with thejprojections bonded additionally tothe head at 32' as shown in Figure 10 as to form a vvery strong joint and impart considerable depth of section at the joint. V I1 1 It is decidedly desirable to stop the brazing operation as soon as the fillet 25 forms at the outside as this is an indication of complete fusion and further heating is likely-*- 'to undesirably further spread the brazing metal and weaken the joint. 'The preferred practice is to'remove the source of heat, allow the metal to solidify and quench immediately in any suitable quenching medium such as water.

After the head has been united at one end, the structure is turned upside down and the head at the other end alloy and to assure'reliable results. I a

The projections not only serve to assure proper positiming of the 'barrelwith' respect 'to the head, but they brazing; a a a j After the completion of the brazing operation the structure will desirably be heat treated as for-example by exalso assurea stronger structure after the completion of posing it to a suitable elevated temperature for'a period V 'of the order of 8 hours;

The resulting bobbin has unusually fgreat'streiigtli.

Using a two and one-halfinch' outside diameter barrel awall thickness of 0.080 inch. bobbins according to the present invention under test have withstood tension 7 loadsasgreatlas 9000 poundsl'applie'd axially. to the heads.

After completion ofthelbrazing and heat treating 'as 7 above, described, the gudgeons are forced into position.

It-will vbe evident that in the construction of the invenby the projections on the one head, rotating the combination substantiallyon the verticalaxes of the barrel while heating the combination locally at one side'adjac'ent to the supply of brazing metal until thebrazing metal flows outward from the space inside said barrel and fills in radi= ally of-the joint being formed between said face of, the one head and-the corresponding end of the barrel through to the outside of. the barrel giving an outward continuous fillet connecting to the barrel andto the one head, allowing the brazing metal to solidify, disposing a supply df brazing metal on said other head adjacent to the posi= tionwhere the 'barrelis 'adaptedtobe'eng'agerl by the projections on-said other head, placing the other end of the barrel in a vertical position. on the upper face of the other head with the plurality, of spaced projections on the latter head engaging the inside of the barrel, rotating the combination substantially on the vertical axis of the barrel While heating the combination locally at, oneside adja .cent to where said'barrel and said other. head are engaged until the brazing metal then being heated flows outward from the space inside the barrel and fills in radiallyof the joint being formed between said 'face of said otherihead and the corresponding end of the barrel through to the outside of the barrel giving an outward continuous symmetrical fillet connecting to the barrel and to said other head, and allowing the related supply of brazing 'metal to solidify while said one head remains brazed to the barrel, accordingly producing a bobbin unit in which both of said heads are brazedto'the barreliand' in whichthe outside fillets impose barriers against 'thezintrusion of yarnor thread between the heads and the barrel.

.2. The method according to claim 1' in'which theends of the barrel as provided form acute, angles-opening toward the insidejofthe barrel with 'rcspectto the'c o'rresponding faces of the heads on which the barrel is disposed vertically for; brazing, thus 'afiording pockets accommodating the outward flow of the brazing metal-from iiisidejthe barrel when the'brazing metal is heated to fusion.

3. The methodaccording to claim lin which the ends of theibarrel are provided in a tapered condition andiac- ,cordingly made to orm anglesof 1 to 6 openingtoward the insideofthe barrel with' respect to the corresponding cally for-brazing, thus affording pockets accommodating I the outward flowof the brazing metal from inside the tion there .is little any tendency for the thread or yarn barrel when-the brazing metal is 'heatedto fusions.

' to enter betweengthe head and the barrel. The' head, is verystrongindeed, and loads andloads develfaces of the'heads on which the barrel is' disposed verti 4. The method according to claim 1 in which the brazthe metal extending adjacent to the inside surface of the barrel prior to brazing.

References Cited in the file of this patent UNITED STATES PATENTS Prahar Dec. 14, 1909 Warner Oct. 18, 1921 Petty Ian. 8, 1929 Bilger et a1. Apr. 21, 1931 Reutter Apr. 30, 1935 Mossberg et al. Mar. 14, 1939 Olsen et a1 June 16, 1942 6 Anderson May 25, 1943 Hansen June 11, 1946 Fox Dec. 4, 1951 Agule Oct. 6, 1953 Line July 6, 1954 Jarmicki Aug. 24, 1954 Boam et al. Aug. 9, 1955 Bloss Jan. 17, 1956 OTHER REFERENCES How and Where To Use Electric-Furnace Brazing (Weber), published by General Electric Co., Dec. 8, 1938 (p. 34 relied on). 

